May lost 13 seats at the General Election before returning to Number 10. (Source: Getty)

Mark Sands

Prime Minister Theresa May has lost yet another advisor with the departure of Downing Street's head of government relations, who led liaisons with business and campaign groups.

Chris Brannigan, a former Iraq war veteran recruited as part of an effort to boost ties with the business world, has followed a number of political staff in departing, despite only joining Number 10 less than a year ago.